[dpdk-dev] [PATCH] vhost: Fix default value of kickfd and callfd
Tetsuya Mukawa
mukawa at igel.co.jp
Thu Mar 10 07:14:22 CET 2016
Currently, default value of kickfd and callfd is -1.
If the value is -1, current code guess kickfd and callfd hasn't been
initialized yet. And vhost library will guess the virtqueue isn't ready
for processing.
But callfd and kickfd will be set as -1 when "--enable-kvm"
isn't specified in QEMU command line. It means we cannot treat -1 as
uninitialized state. The patch changes default value to -2. And the
patch defines -2 as VIRTIO_UNINITIALIZED_EVENTFD.
Signed-off-by: Tetsuya Mukawa <mukawa at igel.co.jp>
---
lib/librte_vhost/rte_virtio_net.h | 1 +
lib/librte_vhost/vhost_user/virtio-net-user.c | 7 ++++---
lib/librte_vhost/virtio-net.c | 4 ++--
3 files changed, 7 insertions(+), 5 deletions(-)
diff --git a/lib/librte_vhost/rte_virtio_net.h b/lib/librte_vhost/rte_virtio_net.h
index 7d1fde2..d745707 100644
--- a/lib/librte_vhost/rte_virtio_net.h
+++ b/lib/librte_vhost/rte_virtio_net.h
@@ -89,6 +89,7 @@ struct vhost_virtqueue {
uint16_t vhost_hlen; /**< Vhost header length (varies depending on RX merge buffers. */
volatile uint16_t last_used_idx; /**< Last index used on the available ring */
volatile uint16_t last_used_idx_res; /**< Used for multiple devices reserving buffers. */
+#define VIRTIO_UNINITIALIZED_EVENTFD (-2)
int callfd; /**< Used to notify the guest (trigger interrupt). */
int kickfd; /**< Currently unused as polling mode is enabled. */
int enabled;
diff --git a/lib/librte_vhost/vhost_user/virtio-net-user.c b/lib/librte_vhost/vhost_user/virtio-net-user.c
index 65b5652..591f9bf 100644
--- a/lib/librte_vhost/vhost_user/virtio-net-user.c
+++ b/lib/librte_vhost/vhost_user/virtio-net-user.c
@@ -225,8 +225,8 @@ static int
vq_is_ready(struct vhost_virtqueue *vq)
{
return vq && vq->desc &&
- vq->kickfd != -1 &&
- vq->callfd != -1;
+ vq->kickfd != VIRTIO_UNINITIALIZED_EVENTFD &&
+ vq->callfd != VIRTIO_UNINITIALIZED_EVENTFD;
}
static int
@@ -318,7 +318,8 @@ user_get_vring_base(struct vhost_device_ctx ctx,
*/
if (dev->virtqueue[state->index]->kickfd >= 0) {
close(dev->virtqueue[state->index]->kickfd);
- dev->virtqueue[state->index]->kickfd = -1;
+ dev->virtqueue[state->index]->kickfd =
+ VIRTIO_UNINITIALIZED_EVENTFD;
}
return 0;
diff --git a/lib/librte_vhost/virtio-net.c b/lib/librte_vhost/virtio-net.c
index fe1a77e..3498e9d 100644
--- a/lib/librte_vhost/virtio-net.c
+++ b/lib/librte_vhost/virtio-net.c
@@ -263,8 +263,8 @@ init_vring_queue(struct vhost_virtqueue *vq, int qp_idx)
{
memset(vq, 0, sizeof(struct vhost_virtqueue));
- vq->kickfd = -1;
- vq->callfd = -1;
+ vq->kickfd = VIRTIO_UNINITIALIZED_EVENTFD;
+ vq->callfd = VIRTIO_UNINITIALIZED_EVENTFD;
/* Backends are set to -1 indicating an inactive device. */
vq->backend = -1;
--
2.1.4
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